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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369a5add74de4aa70e05e9e98ebcb1dfd7b76dd71ea336fb7479e4b997bc50ee' 
  AND token = 'RLQUf7mvoWhdnllPpX4ZmuC1pit1d4KkZ80WOH+jCGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}